INFO: task syz-executor:6548 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6548 tgid:6548 ppid:6539 task_flags:0x400140 flags:0x00000010 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0x13b0/0x2864 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xb4/0x230 kernel/sched/core.c:7058 wb_wait_for_completion+0x150/0x280 fs/fs-writeback.c:216 __writeback_inodes_sb_nr+0x1b0/0x218 fs/fs-writeback.c:2748 writeback_inodes_sb_nr fs/fs-writeback.c:2765 [inline] writeback_inodes_sb+0x78/0x8c fs/fs-writeback.c:2780 sync_filesystem+0xa0/0x218 fs/sync.c:54 generic_shutdown_super+0x70/0x2b8 fs/super.c:622 kill_block_super+0x44/0x90 fs/super.c:1766 exfat_kill_sb+0x40/0x70 fs/exfat/super.c:801 deactivate_locked_super+0xc4/0x12c fs/super.c:474 deactivate_super+0xe0/0x100 fs/super.c:507 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1375 __cleanup_mnt+0x20/0x30 fs/namespace.c:1382 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x168 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by kthreadd/2: 4 locks held by kworker/0:0/9: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/14: 1 lock held by khungtaskd/32: #0: ffff80008fa49aa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 6 locks held by kworker/R-write/34: 3 locks held by kworker/u8:2/41: 3 locks held by kworker/u8:3/42: 6 locks held by kworker/u9:0/52: #0: ffff0000d51ba148 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3210 #1: ffff800099457be0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3210 #2: ffff0000d54b0dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x184/0x33c net/bluetooth/hci_sync.c:331 #3: ffff0000d54b00b8 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x1d4/0xbb8 net/bluetooth/hci_sync.c:5670 #4: ffff800092cbb6a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2079 [inline] #4: ffff800092cbb6a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x13c/0x318 net/bluetooth/hci_conn.c:1313 #5: ffff0000de9abb38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x74/0x5f0 net/bluetooth/l2cap_core.c:1762 3 locks held by kworker/u8:4/361: 4 locks held by kworker/u8:5/1854: #0: ffff0000c0032148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3210 #1: ffff8000a01a7be0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3210 #2: ffff800092b517e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #3: ffff0000d2988768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6212 [inline] #3: ffff0000d2988768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2471 [inline] #3: ffff0000d2988768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x11c/0xdb0 net/wireless/reg.c:2486 3 locks held by kworker/R-ipv6_/4204: #0: ffff0000d247a948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3210 #1: ffff8000a1787bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3210 #2: ffff800092b517e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 5 locks held by kworker/R-bat_e/4279: 3 locks held by kworker/u8:6/4490: 3 locks held by kworker/u8:7/4725: 5 locks held by kworker/u9:1/6143: #0: ffff0000c8b4a148 ((wq_completion)hci2){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3210 #1: ffff80009fa77be0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3210 #2: ffff0000c7a1cdc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x184/0x33c net/bluetooth/hci_sync.c:331 #3: ffff0000c7a1c0b8 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x1d4/0xbb8 net/bluetooth/hci_sync.c:5670 #4: ffff800092cbb6a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2079 [inline] #4: ffff800092cbb6a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x13c/0x318 net/bluetooth/hci_conn.c:1313 3 locks held by kworker/R-ext4-/6149: #0: ffff0000d81d1948 ((wq_completion)ext4-rsv-conversion){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3210 #1: ffff80009fa57bc0 ((work_completion)(&ei->i_rsv_conversion_work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3210 #2: ffff0000d8244950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe4c/0x10dc fs/jbd2/transaction.c:442 1 lock held by klogd/6172: 2 locks held by udevd/6183: 1 lock held by dhcpcd/6237: 3 locks held by dhcpcd/6238: 1 lock held by crond/6312: 2 locks held by getty/6328: #0: ffff0000d30b70a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800099f5e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222 1 lock held by syz-executor/6531: 1 lock held by udevd/6535: #0: ffff0000c154ccb8 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:885 [inline] #0: ffff0000c154ccb8 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_read_iter+0x2a0/0x3dc block/fops.c:851 2 locks held by syz-executor/6541: 2 locks held by syz-executor/6542: #0: ffff0000c7a18dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close net/bluetooth/hci_core.c:499 [inline] #0: ffff0000c7a18dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x1fc/0x4c0 net/bluetooth/hci_core.c:2715 #1: ffff0000c7a180b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x4c4/0x1154 net/bluetooth/hci_sync.c:5282 5 locks held by kworker/u9:2/6544: #0: ffff0000d51bc148 ((wq_completion)hci4){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3210 #1: ffff80009f307be0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3210 #2: ffff0000d54b4dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x184/0x33c net/bluetooth/hci_sync.c:331 #3: ffff0000d54b40b8 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x1d4/0xbb8 net/bluetooth/hci_sync.c:5670 #4: ffff800092cbb6a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2079 [inline] #4: ffff800092cbb6a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x13c/0x318 net/bluetooth/hci_conn.c:1313 1 lock held by syz-executor/6548: #0: ffff0000d6cfa0e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff0000d6cfa0e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff0000d6cfa0e0 (&type->s_umount_key#52){+.+.}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:506 4 locks held by kworker/0:3/6588: 4 locks held by kworker/1:5/6602: 4 locks held by kworker/0:5/6622: 3 locks held by kworker/u8:8/6662: 1 lock held by syz.4.5/6667: #0: ffff80008fa4f440 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x58/0x528 kernel/rcu/tree.c:3815 1 lock held by syz.2.6/6676: #0: ffff80008fa4f440 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x58/0x528 kernel/rcu/tree.c:3815 3 locks held by kworker/u8:9/6680: 3 locks held by kworker/u8:10/6682: 2 locks held by kworker/u8:11/6683: 3 locks held by kworker/u8:12/6684: 4 locks held by kworker/u8:13/6685: =============================================